CN101660019A - Electric furnace burden process with high efficiency and low cost - Google Patents
Electric furnace burden process with high efficiency and low cost Download PDFInfo
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- CN101660019A CN101660019A CN200910018449A CN200910018449A CN101660019A CN 101660019 A CN101660019 A CN 101660019A CN 200910018449 A CN200910018449 A CN 200910018449A CN 200910018449 A CN200910018449 A CN 200910018449A CN 101660019 A CN101660019 A CN 101660019A
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Abstract
The invention relates to an electric furnace burden process with high efficiency and low cost. Main raw materials are molten iron accounting for 30-60 percent of metal adding amount, excellent scrap steel accounting for 5-10 percent of metal adding amount and low-lost scrap steel accounting for 30-35 percent of metal adding amount; auxiliary materials are lime and soft burning dolomite, wherein 3.0-3.5 percent of lime and 1.0-1.5 percent of soft burning dolomite are respectively added in each ton of molten steel; and through optimizing electric furnace slag discharge operation, using an oxygenlance and adopting power supply oxygen blowing control and other smelting processes, the electric furnace burden process greatly improves simultaneous hit rate of terminal point components and the temperature of an electric arc furnace, realizes the aims of improving the quality of the molten steel, shortening the smelting period and reducing the consumption and significantly reduces the full oxygen content of steel products at the same time. The electric furnace burden process has good application prospect for ensuring the quality of steel and reducing the production cost.
Description
Technical field:
The invention belongs to field of iron and steel smelting, relate generally to electric furnace burden process.
Technical background:
" steel scrap+molten iron " is the electric furnace batching mode that most of steel mills generally adopt, the defective that this batching mode exists is: if the molten iron amount of being blended into is too small, the carbon amount that then is used for oxidation is low, the chemical heat that is produced by the C-O reaction is few, be unfavorable for the intensification of quick melting waste steel and molten bath, also be difficult to subdue residual element content; If the molten iron amount of being blended into is excessive, mixed carbon comtent height then, easily oxidation elemental silicon, manganese are also high, are subjected to the influence of selective oxidation, often molten clear carbon high phosphorus height occurs, cause power failure decarburization dephosphorization; Melt clear back slag thickness, winding-up oxygen slag steel backwash is serious, and the water cooled cover steel bonding is serious, and towing loop connects electric beating Lou and happens occasionally, and also can cause stove along rise in addition, bell rotation difficulty etc.The present molten steel end point carbon of final body, phosphorus and three indexs of temperature can not reach target call simultaneously, influence smelting cycle, cause energy and consume and rise.
Because the steel scrap price is higher at present, the quality instability, the rate of recovery is low, and cost increased after electric furnace added a large amount of steel scraps, therefore, burden structure was suitably adjusted, and reduced the iron and steel stock cost and became the task of top priority, needed significant to each steel mill.
CN1796586 discloses a kind of technique for smelting mother liquor of stainless steel from electric furnace, and its step comprises: a) batching: the stainless steel steel scrap, account for 15～25% of metal add-on, and ferrochrome accounts for 15～25% of metal add-on, lime adding amount 30～45kg/ ton; Dephosphorization molten iron, additional proportion are 35～60%, Composition Control C2.50～3.80%, P≤0.020%, S≤0.040%; B) melting, blowing oxygen quantity is controlled at: 5～10m3/t, oxygen blast flow: 1500～2500Nm3/h; Blowing oxygen quantity control: 5～10m3/t; C) reduction, ferrosilicon powder spray into 2.5～3.5kg/t, carbon dust sprays into 1.5～2.5kg/t or adds ferrosilicon 2.5～3.5kg/t, aluminium 1.5～2.5kg/t; D) tapping, terminal temperature control: 1640～1660 ℃.
The smelting process of a CN101148734 ferrite stainless steel mother liquid: adopt the batching pattern of dephosphorization molten iron+carbon steel steel scrap+ferrochrome to smelt ferritic stainless steel.Promptly add carbon steel steel scrap and ferrochrome after adding the dephosphorization molten iron, and energising; When being energized to 2.0～4.0Mwh, add ferrosilicon; Begin oxygen blast when being energized to 5.0～7.0Mwh; When power consumption reached 8.0～12.0Mwh, the oxygen blast flow was adjusted into 2500Nm3/h, and total blowing oxygen quantity is 9～10Nm3/t; When power consumption is 7.0～10.0Mwh, add lime; When power consumption is 16.0～20.0Mwh, the winding-up carbon dust; When power consumption is 15.0～18.0Mwh, add rhombspar; When being energized to 220-240Kwh/t, thermometric, during temperature 〉=1610 ℃, reduction; When being energized to 250-320Kwh/t, thermometric, tapping when temperature reaches 1630～1660 ℃.
More than the burden structure of two kinds of patents only be fit to smelting stainless steel, for most of steel grades and inapplicable.In electric furnace, carry out oxidation, reduction simultaneously, the power consumption height, smelting cycle is long, to molten iron, iron and steel stock specification of quality height, the necessary dephosphorization of molten iron, iron and steel stock is respectively stainless steel steel scrap and carbon steel steel scrap, cost height.
Summary of the invention:
The electric furnace burden process that the purpose of this invention is to provide a kind of composition optimizes improves electrosmelting efficient, and production cost reduces.
Technical scheme of the present invention is, a kind of electric furnace burden process of high efficiency, low cost, and its step is as follows:
(1) major ingredient: molten iron accounts for 30～60% of metal add-on, and the high-quality steel scrap accounts for 5～30% of metal add-on, and cheap steel scrap accounts for 30～45% of metal add-on;
(2) auxiliary material: the certain proportion that auxiliary material is pressed iron and steel stock weight adds lime 3.0～3.5%, light dolomite 1.0～1.5%;
(3) fire door and slagging operation: after the tapping, clear up, had a snack stove gate, to guarantee not flow slag early stage; Before furnace charge melts clearly, not slagging; After melting clearly, flow slag operation automatically; Liquid steel temperature reaches 1580～1600 ℃, carries out suitable slagging operation.
(4) the oxygen rifle uses: the flow control of fire door oxygen rifle is at 1500～1800Nm3/h, and furnace wall rifle flow control is at 1000～1500Nm3/h;
(5) power supply oxygen blast control: send electricity and oxygen blast to carry out simultaneously after a defective material feeds in raw material and finishes, send electricity 2 minutes, stop power supply, keep oxygen blast, oxygen pressure 1.20～1.50Mpa, oxygen blow duration 6～8 minutes, steel scrap are all molten to be reset and added into two defective materials, send electricity and oxygen blast to carry out simultaneously, send electricity 2 minutes, stop power supply, keep oxygen blast, oxygen pressure 1.20～1.50Mpa, oxygen blow duration 5～10 minutes; Oxygen pressure 0.80～1.50Mpa is adjusted in the molten clear back of two defective materials, carries out stove gate spray coke powder making foamed slag simultaneously, realizes the power supply submerged arc, and 4～6 minutes, liquid steel temperature reached 1500～1540 ℃;
(6) molten steel composition control: carbon content 0.30～0.80%, phosphorus content 0.010～0.030%.
Above-mentioned cheap steel scrap mainly comprises slag steel, jar group, jar iron, magnesium iron and beans steel.
The electric furnace burden process of above-mentioned high efficiency, low cost, preferred, molten iron accounts for 55～60% of metal add-on in the step (1).
The electric furnace burden process of above-mentioned high efficiency, low cost, soft steel is controlled at 1510～1550 ℃ to refining position liquid steel temperature; Medium carbon steel is controlled at 1500～1540 ℃ to refining position liquid steel temperature.
In the electrosmelting process, if adopt full scrap smelting, then smelting cycle is longer, but after being blended into molten iron, smelting cycle obviously shortens, and rhythm is accelerated significantly, is blended into molten iron 15%～30% smelting cycle and changes little, 30% to 60%, smelt rhythm and obviously accelerate with the increase of iron water amount, surpass 60%, smelting cycle changes not obvious, even increase arranged slightly also, after illustrating that the molten iron ratio that is blended into surpasses 60%, the C in the molten bath is higher, and constituent contents such as Si, Mn, P are higher, cause dephosphorization in the stove, decarburization time to prolong, become and improve the restricted link of smelting rhythm.Become obvious linear dependence between the molten iron amount of being blended into and the power consumption, along with molten iron is blended into to such an extent that increase, power consumption reduces gradually, and consumption of electrode is low more but after surpassing 60%, power consumption reduces curve and slows down.Consumption of electrode and power consumption are proportional, so power consumption reduces, consumption of electrode is also along with reduction.In addition, along with molten iron is blended into the raising of ratio, the oxygen consumption is slow ascendant trend, the about 12.7m of oxygen consumption ton steel increase when the oxygen consumption when being blended into 70% above molten iron is blended into 15～30% molten iron
3, but whole increasing degree is little, and the utilization ratio of oxygen increases.
By above analysis as can be known, molten iron was blended into ratio at 55～60% o'clock, and melting electric consumption, oxygen consumption and iron and steel stock total cost are minimum, and be the most favourable to saving energy and reduce the cost, reducing production costs.
Adopt the slag making of light dolomite instead of part Wingdale, improve MgO content in the slag, reduce the erosion of slag to furnace lining, have positive effect to improving furnace life, next uses light dolomite than directly using rhombspar can reduce because of the higher problem of the energy consumption of rhombspar in the thermal degradation process.
The invention has the beneficial effects as follows: the present invention mainly goes into stove amount (30～35%) by what optimize that electric furnace batching, charging method and smelting technology increase that molten iron is blended into ratio (55～60%) and cheap steel scrap, has increased substantially electric arc furnace terminal point composition and temperature hit rate; Power-on time shortens 6 minutes, and melting electric consumption on average reduces the 58kWh/t steel, reaches the 143Kwh/t steel, consumption of electrode reduces the 0.30kg/t steel, reaches the 1.40Kg/t steel, has diluted harmful residual element simultaneously, has reduced the content of gas and inclusion in the molten steel.Production cost reduces by 167 yuan of/ton steel.Reached and improved steel quality, shorten smelting cycle and reduce the purpose that consumes, the steel total oxygen content reduces, to guarantee steel product quality, to reduce production costs have good application prospects.
Description of drawings
Fig. 1 is the relation of figure molten iron and power consumption, and wherein X-coordinate is hot metal ratio (%), and ordinate zou is power consumption (kWh).
Embodiment:
Embodiment 1:
Novel burden structure effectively is applied to 50 tons of electric arc furnace productions of Laigang special steel factory, electric arc furnace terminal point composition and temperature hit rate bring up to 91% by 67% simultaneously, power-on time shortens 6 minutes, melting electric consumption reduces the 58kWh/t steel, consumption of electrode reduces the 0.30kg/t steel, the steel total oxygen content reduces obviously, and production cost reduces by 167 yuan of/ton steel.Reached and improved steel quality, shorten smelting cycle and reduce the purpose that consumes.
1 furnace charge is packed into
Major ingredient: molten iron accounts for 30% of metal add-on, and the high-quality steel scrap accounts for 30% of metal add-on, and cheap steel scrap accounts for 40% of metal add-on;
Auxiliary material: the certain proportion that auxiliary material is pressed iron and steel stock weight adds lime 3.0～3.5%, light dolomite 1.0～1.5%;
1.1 surplus steel amount 15～30%, and stay slag (tapping melt down after, tap hole does not flow slag and gets final product) as far as possible.
1.2, rationally be blended into molten iron according to situations such as material source, oxygen pressures
Because the iron and steel stock carbon content is different with harmful element, oxygen pressure is subjected to the external conditions restrictive stability relatively poor, in time adjusts the molten iron amount of being blended into, when the iron and steel stock carbon content is higher, can suitably reduce the molten iron amount of being blended into, when harmful element such as copper are high, can increase the molten iron amount of being blended into, the dilution residual element; When oxygen pressure was big, iron water amount can suitably increase, and oxygen is pressed hour, reduces the molten iron amount of being blended into.
1.3 after every stove tapping, observe situation in the stove, according to Yu Gangliang, consider practical situation such as ladle, the iron and steel stock rate of recovery simultaneously, suitably adjust total Intake Quantity.
2 fire doors and slagging operation
2.1 after the tapping, clear up, had a snack stove gate, to guarantee not flow slag early stage.
2.2 a defective material (going into furnace charge the first time when smelting every stove molten steel) and two defective materials are (because the steel scrap volume is bigger, the rate of recovery is lower, cause the furnace charge that adds for the first time can't satisfy often to set tap and adding molten second defective material of adding after clear of pan feeding for the first time) molten clear before, not slagging; After melting clearly, flow slag operation automatically; Liquid steel temperature reaches 1580～1600 ℃, carries out suitable slagging operation.
2.3 molten clear phosphorus height occurs, 1580～1600 ℃ are changed slag operation.
3 oxygen rifles use operation
3.1 a defective material and two defective materials normally use fire door and wall lance before melting clearly.
3.2 two defective materials normally use wall lance after melting clearly, pressure 1.20～1.50Mpa and flow 1200～1500Nm3/h according to molten clear carbon situation, adjust pressure 0.80～1.50Mpa and flow 800～1500Nm3/h; Slag thickness, excessively rare or very few, the foaming weak effect bans use of fire door oxygen rifle; Slag fluidity and bubble effectively can be used fire door oxygen rifle, but flow necessary＜50% peak flow, promptly less than 900Nm3/h.
4 send electricity and foamy slag operation
4.1 after melting clearly, the slag thickness, the foaming weak effect forbids sending electricity, adds fluorite and purges the top of the slag with the oxygen pipe; Slag is rare, adds lime and strengthen to dust; Slag amount is few, in time adds slag charge.
4.2 after molten clear, slag fluidity and bubble effectively according to molten clear carbon situation, is sent electricity, makes composition and temperature reach the tapping requirement simultaneously in good time.
5 electric furnaces are controlled with the oxygen power supply
5.1 a defective material is controlled with the oxygen power supply
After adding a defective material and being blended into molten iron, molten iron and Yu Gang account for about 65% of total amount in the stove, have created good thermodynamic condition for realizing that strengthen early stage with oxygen.
Behind reinforced the finishing, send electricity and oxygen blast to carry out simultaneously, send electricity 2 minutes, stop power supply, keep oxygen blast, oxygen pressure 1.20～1.50Mpa, oxygen blast is reset and added into two defective materials one defective material oxygen blow duration 6～8 minutes to steel scrap is all molten.
Oxygen is used in the reinforcement of one defective material, helps oxidation desiliconization demanganize in early stage, improves the molten bath liquid steel temperature.The oxygen pressure flow is big, and agitation molten pool promotes the heat transmission, improves bigger slag steel, jar group and jar iron temperature of lumpiness that a defective material adds, and is beneficial to the later stage fusing.
5.2 two defective materials are controlled with the oxygen power supply
After adding two defective materials (contain some heats and be blended into molten iron), send electricity and oxygen blast to carry out simultaneously, send electricity 2 minutes, stop power supply, keep oxygen blast, oxygen pressure 1.20～1.50Mpa, 5～10 minutes time length.According to flue gas and slag situation, determine big pressure oxygen blow duration, flue gas is dense, slag is thick, the oxygen blow duration capping, but and proper extension; Flue gas is light, and slag fluidity is good, and oxygen blow duration takes off limit, and can suitably shorten.
5.3 molten clear back is controlled with the oxygen power supply
Adjust oxygen pressure 0.80～1.50Mpa, send electricity, carry out stove gate spray coke powder making foamed slag simultaneously, realize the power supply submerged arc, 4～6 minutes, liquid steel temperature reached 1540 ℃, the sampling total analysis.According to the total analysis result, adjust oxygen pressure, carbon is higher, upper limit control; Carbon is on the low side, lower limit control, and cancellation fire door oxygen gun blowing.
Stable Yu Gangliang, the molten iron amount of being blended into, Intake Quantity, stable powers with oxygen, can guarantee molten clear back carbon content 0.30～0.80%, and phosphorus content 0.010～0.030% has been created condition for smelting control after molten.Stable molten clear composition according to the requirement of different steel grade terminal point, is suitably adjusted oxygen pressure and flow and power supply, can stablize and realize that electric arc furnace end point carbon, phosphorus and temperature reach the controlled target requirement simultaneously.
If clear back carbon is melted in appearance, phosphorus is higher, stop to send electricity and dust, the oxygen pressure upper limit is controlled, and oxygen blast was sent electricity after 3～5 minutes, carried out stove gate spray coke powder making foamed slag simultaneously, realized the power supply submerged arc.Molten clear back carbon is on the low side, phosphorus is higher, adds slag charge, send electric oxygen blast, strengthens dephosphorization if occur.
6 tapping temperatures
Soft steel is controlled at 1510～1550 ℃ to refining position liquid steel temperature; Medium carbon steel is controlled at 1500～1540 ℃ to refining position liquid steel temperature.
Embodiment 2:
Other is with embodiment 1.Difference is:
Major ingredient: molten iron accounts for 60% of metal add-on, and the high-quality steel scrap accounts for 5% of metal add-on, and cheap steel scrap accounts for 35% of metal add-on;
Auxiliary material: molten steel per ton need add lime 3.0%, light dolomite 1.5% respectively;
Embodiment 3
Other is with embodiment 1, and difference is:
Major ingredient: molten iron accounts for 40% of metal add-on, and the high-quality steel scrap accounts for 30% of metal add-on, and cheap steel scrap accounts for 30% of metal add-on;
Auxiliary material: molten steel per ton need add lime 3.5%, light dolomite 1.0% respectively;
Embodiment 4
Other is with embodiment 1, and difference is:
Major ingredient: molten iron accounts for 35% of metal add-on, and the high-quality steel scrap accounts for 20% of metal add-on, and cheap steel scrap accounts for 45% of metal add-on;
Auxiliary material: molten steel per ton need add lime 3.0%, light dolomite 1.5% respectively;
Claims (4)
1, a kind of electric furnace burden process of high efficiency, low cost is characterized in that step is as follows:
(1) major ingredient: molten iron accounts for 30～60% of metal add-on, and the high-quality steel scrap accounts for 5～30% of metal add-on, and cheap steel scrap accounts for 30～45% of metal add-on;
(2) auxiliary material: auxiliary material adds respectively in the ratio of iron and steel stock weight, lime 3.0～3.5%, light dolomite 1.0～1.5%;
(3) fire door and slagging operation: after the tapping, clear up, had a snack stove gate, to guarantee not flow slag early stage; Not slagging before furnace charge melts clearly; After melting clearly, flow slag operation automatically; Liquid steel temperature reaches 1580～1600 ℃, carries out the slagging operation;
(4) the oxygen rifle uses: the flow control of fire door oxygen rifle is at 1500～1800Nm3/h, and furnace wall rifle flow control is at 1000～1500Nm3/h;
(5) power supply oxygen blast control: send electricity and oxygen blast to carry out simultaneously after a defective material feeds in raw material and finishes, send electricity 2 minutes, stop power supply, keep oxygen blast, oxygen pressure 1.20～1.50Mpa, oxygen blow duration 6～8 minutes, steel scrap are all molten to be reset and added into two defective materials, send electricity and oxygen blast to carry out simultaneously, send electricity 2 minutes, stop power supply, keep oxygen blast, oxygen pressure 1.20～1.50Mpa, oxygen blow duration 5～10 minutes; Oxygen pressure 0.80～1.50Mpa is adjusted in the molten clear back of two defective materials, carries out stove gate spray coke powder making foamed slag simultaneously, realizes the power supply submerged arc, and 4～6 minutes, liquid steel temperature reached 1500～1540 ℃;
(6) molten steel composition control: carbon content 0.30～0.80%, phosphorus content 0.010～0.030%.
2, the electric furnace burden process of high efficiency, low cost according to claim 1 is characterized in that: cheap steel scrap mainly comprises slag steel, jar group, jar iron, magnesium iron and beans steel.
3, the electric furnace burden process of high efficiency, low cost according to claim 1 is characterized in that: molten iron accounts for 55～60% of metal add-on in the step (1).
4, according to the electric furnace burden process of each described high efficiency, low cost in the claim 1～3, it is characterized in that: soft steel is controlled at 1510～1550 ℃ to refining position liquid steel temperature; Medium carbon steel is controlled at 1500～1540 ℃ to refining position liquid steel temperature.
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| CN200910018449A CN101660019A (en) | 2009-09-28 | 2009-09-28 | Electric furnace burden process with high efficiency and low cost |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101993972A (en) * | 2010-11-03 | 2011-03-30 | 莱芜钢铁股份有限公司 | Arc furnace steelmaking method |
| CN102251072A (en) * | 2010-08-23 | 2011-11-23 | 攀钢集团钢铁钒钛股份有限公司 | Dephosphorizing process of electric furnace steel making |
| CN103014231A (en) * | 2012-12-28 | 2013-04-03 | 攀枝花钢城集团瑞钢工业有限公司 | Oxygen supplying method for smelting slag steel and slag iron by electric arc furnace |
| CN104131134A (en) * | 2014-07-08 | 2014-11-05 | 莱芜钢铁集团有限公司 | Technology for fabricating foaming slag in arc furnace molten pool |
| CN104513931A (en) * | 2013-09-30 | 2015-04-15 | 北大方正集团有限公司 | Cold heading steel, cold heading steel ladle furnace refining process, and cold heading steel production process |
| CN105087859A (en) * | 2014-05-13 | 2015-11-25 | 镇江忆诺唯记忆合金有限公司 | Method for reducing oxygen content of non-diffusion precipitation deoxidation smelting molten steel |
| CN112322994A (en) * | 2020-11-04 | 2021-02-05 | 南阳汉冶特钢有限公司 | Method for producing low-cost Q355B medium plate through medium plate alloy leftover material |
| CN112553401A (en) * | 2020-12-03 | 2021-03-26 | 武汉重工铸锻有限责任公司 | Method for increasing yield of steel-making iron and steel materials in electric arc furnace |
| CN112760449A (en) * | 2020-12-22 | 2021-05-07 | 鞍钢铸钢有限公司 | Smelting method of slag steel used by Consteel electric furnace |
| CN115305310A (en) * | 2022-09-13 | 2022-11-08 | 江苏省沙钢钢铁研究院有限公司 | Method for using metallized pellets in electric arc furnace |
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- 2009-09-28 CN CN200910018449A patent/CN101660019A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102251072A (en) * | 2010-08-23 | 2011-11-23 | 攀钢集团钢铁钒钛股份有限公司 | Dephosphorizing process of electric furnace steel making |
| CN102251072B (en) * | 2010-08-23 | 2013-02-13 | 攀钢集团钢铁钒钛股份有限公司 | Dephosphorizing process of electric furnace steel making |
| CN101993972B (en) * | 2010-11-03 | 2012-12-19 | 山东钢铁股份有限公司 | Arc furnace steelmaking method |
| CN101993972A (en) * | 2010-11-03 | 2011-03-30 | 莱芜钢铁股份有限公司 | Arc furnace steelmaking method |
| CN103014231A (en) * | 2012-12-28 | 2013-04-03 | 攀枝花钢城集团瑞钢工业有限公司 | Oxygen supplying method for smelting slag steel and slag iron by electric arc furnace |
| CN103014231B (en) * | 2012-12-28 | 2015-03-11 | 攀枝花钢城集团瑞钢工业有限公司 | Oxygen supplying method for smelting slag steel and slag iron by electric arc furnace |
| CN104513931A (en) * | 2013-09-30 | 2015-04-15 | 北大方正集团有限公司 | Cold heading steel, cold heading steel ladle furnace refining process, and cold heading steel production process |
| CN105087859A (en) * | 2014-05-13 | 2015-11-25 | 镇江忆诺唯记忆合金有限公司 | Method for reducing oxygen content of non-diffusion precipitation deoxidation smelting molten steel |
| CN104131134A (en) * | 2014-07-08 | 2014-11-05 | 莱芜钢铁集团有限公司 | Technology for fabricating foaming slag in arc furnace molten pool |
| CN104131134B (en) * | 2014-07-08 | 2016-06-08 | 莱芜钢铁集团有限公司 | The technique of making foamed slag in a kind of electric arc furnace molten bath |
| CN112322994A (en) * | 2020-11-04 | 2021-02-05 | 南阳汉冶特钢有限公司 | Method for producing low-cost Q355B medium plate through medium plate alloy leftover material |
| CN112553401A (en) * | 2020-12-03 | 2021-03-26 | 武汉重工铸锻有限责任公司 | Method for increasing yield of steel-making iron and steel materials in electric arc furnace |
| CN112760449A (en) * | 2020-12-22 | 2021-05-07 | 鞍钢铸钢有限公司 | Smelting method of slag steel used by Consteel electric furnace |
| CN112760449B (en) * | 2020-12-22 | 2022-10-25 | 鞍钢铸钢有限公司 | Smelting method of slag steel used by Considel electric furnace |
| CN115305310A (en) * | 2022-09-13 | 2022-11-08 | 江苏省沙钢钢铁研究院有限公司 | Method for using metallized pellets in electric arc furnace |
| CN115305310B (en) * | 2022-09-13 | 2023-10-20 | 江苏省沙钢钢铁研究院有限公司 | Use method of metallized pellet in electric arc furnace |
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